WO2021035482A1

WO2021035482A1 - Optical display system and method, and display device

Info

Publication number: WO2021035482A1
Application number: PCT/CN2019/102594
Authority: WO
Inventors: 董瑞君; 王晨如; 刘亚丽; 栗可; 张�浩
Original assignee: 京东方科技集团股份有限公司; 北京京东方光电科技有限公司
Priority date: 2019-08-26
Filing date: 2019-08-26
Publication date: 2021-03-04
Also published as: EP4024120A1; US20220326538A1; EP4024120A4; CN112823307A; US11719935B2

Abstract

An optical display system, comprising: a display screen (11); a light splitting component (12) configured to split light (L) from the display screen (11) into first polarized light (L1) and second polarized light (L2) having different polarization directions; a first light waveguide (13) configured to guide the first polarized light (L1) to a light exit side of the optical display system; and a second light waveguide (14) located at a light exit side of the first light waveguide (13), spaced apart from the first light waveguide (13), and configured to at least partially transmit the first polarized light (L1) and guide the second polarized light (L2) to the light exit side of the optical display system. Also disclosed are an optical display method and a display device.

Description

Optical display system and method, and display device

Technical field

The present disclosure relates to the field of display technology, and in particular, to an optical display system and method, and a display device.

Background technique

Augmented Reality (AR) technology is a new technology that integrates real world information and virtual world information. Information that is difficult to experience in the real world, such as visual information, sound, taste, touch, etc., is superimposed on the real world, so that people have an experience beyond reality.

Virtual Reality (VR) technology is a new technology that transforms data in real life into phenomena that people can feel and expresses it through a three-dimensional model.

In the related art, when viewing a 3D image using an AR display device or a VR display device, the viewer’s eyes will feel fatigued if the viewer’s eyes are viewed for a long time.

Summary of the invention

According to an aspect of the embodiments of the present disclosure, there is provided an optical display system, including: a display screen; a light splitting component configured to divide light from the display screen into first polarized light and second polarized light with different polarization directions A first optical waveguide, configured to guide the first polarized light to the light exit side of the optical display system; and a second optical waveguide, located on the light exit side of the first optical waveguide, and connected to the first The optical waveguides are spaced apart and configured to at least partially transmit the first polarized light and guide the second polarized light to the light exit side of the optical display system.

In some embodiments, the second optical waveguide includes: a second optical waveguide body configured to cause the second polarized light to propagate through total reflection in the second optical waveguide body; The polarization component in the optical waveguide body is configured to at least partially reflect the second polarized light and completely transmit the first polarized light.

In some embodiments, the polarizing component includes a plurality of polarizing reflection films that are parallel and spaced apart from each other, and each polarizing reflection film is configured to partially reflect the second polarized light and partially transmit the second polarized light.

In some embodiments, the polarizing component includes a curved polarizing reflection film, and the polarizing reflection film is configured to completely reflect the second polarized light.

In some embodiments, the first optical waveguide includes: a first optical waveguide body configured to cause the first polarized light to propagate through total reflection in the first optical waveguide body; and The semi-reflective and semi-transmissive component in the optical waveguide body is configured to partially reflect the first polarized light and partially transmit the first polarized light.

In some embodiments, the semi-reflective and semi-transparent component includes a plurality of semi-reflective and semi-transparent membranes that are parallel and spaced apart from each other.

In some embodiments, the optical display system further includes: a first light valve disposed between the light splitting component and the first optical waveguide, and configured to transmit light when the display screen displays a distant view. The first polarized light does not transmit the first polarized light when the display screen displays a close-up image; and a second light valve is provided between the light splitting member and the second optical waveguide and is It is configured to transmit the second polarized light when the display screen displays a close-range picture, and not transmit the second polarized light when the display screen displays a long-range picture.

In some embodiments, at least one of the first light valve and the second light valve includes a liquid crystal light valve.

In some embodiments, the optical display system further includes: a first lens assembly having a first focal length and disposed between the light splitting component and the first optical waveguide; and a second lens assembly having a contact with the A second focal length with a different first focal length is arranged between the light splitting component and the second optical waveguide.

In some embodiments, the optical display system further includes: a third lens assembly arranged between the display screen and the light splitting part; and a fourth lens assembly arranged between the light splitting part and the second lens assembly. Between optical waveguides.

In some embodiments, the optical display system further includes: a fifth lens assembly disposed between the display screen and the light splitting component.

In some embodiments, the optical display system further includes: a variable focal length lens arranged on the light exit side of the second optical waveguide.

In some embodiments, the variable focal length lens includes a liquid crystal lens.

In some embodiments, the light splitting component includes: a polarizing reflector configured to divide the light from the display screen into the first polarized light and the second polarized light; the first reflective component is configured To reflect the first polarized light from the polarized reflection sheet and then enter the first optical waveguide; and a second light reflecting member configured to reflect the second polarized light from the polarized reflection sheet And then incident on the second optical waveguide.

According to another aspect of the embodiments of the present disclosure, there is provided a display device including: the optical display system described in any one of the above embodiments.

According to yet another aspect of the embodiments of the present disclosure, there is provided an optical display method for an optical display system according to any one of the above embodiments, including: a display screen alternately displays a close-range picture and a long-range picture; Divided into a first polarized light and a second polarized light with different polarization directions; when the display screen displays a distant view, the first optical waveguide guides the first polarized light to the light exit side of the optical display system; And when the display screen displays a close-up image, the second optical waveguide guides the second polarized light to the light exit side of the optical display system.

In some embodiments, the optical display system includes a first light valve and a second light valve, the first light valve is disposed between the spectroscopic component and the first optical waveguide, and the second light valve Is arranged between the light splitting component and the second optical waveguide, wherein: when the display screen displays a distant view, the first light valve is controlled to open to transmit the first polarized light, and the The second light valve is closed so as not to transmit the second polarized light; when the display screen displays a close-up image, the first light valve is controlled to be closed so as not to transmit the first polarized light, and the second polarized light is controlled. The light valve is opened to transmit the second polarized light.

In some embodiments, the optical display system includes a variable focal length lens located on the light exit side of the second optical waveguide, and the optical display method further includes: adjusting the focal length when the display screen displays a distant view. The focal length of the variable focal length lens is the first focal length, so that the first polarized light is transmitted to the light exit side of the optical display system through the variable focal length lens and then presents a distant imaging image with a first virtual image distance; When the display screen displays a close-up image, the focal length of the variable focal length lens is adjusted to the second focal length, so that the second polarized light is transmitted to the light exit side of the optical display system through the variable focal length lens A close-up imaging picture with a second virtual image distance is then presented, wherein the second focal length is different from the first focal length, and the second virtual image distance is different from the first virtual image distance.

In some embodiments, the optical display system includes a variable focal length lens located on the light exit side of the second optical waveguide, and the distant view image includes a first distant view image and a second distant view image that are alternately displayed and correspond to different object distances. , The close-up image includes a first close-up image and a second close-up image that are alternately displayed and corresponding to different object distances; the optical display method further includes: when the first long-range image is displayed on the display screen, adjusting the The focal length of the variable focal length lens is the first focal length, so that the first polarized light is transmitted to the light exit side of the optical display system through the variable focal length lens and then presents a first distant imaging image with a first virtual image distance In the case that the display screen displays the second long-distance picture, the focal length of the variable focal length lens is adjusted to the second focal length, so that the first polarized light is transmitted to the lens via the variable focal length lens The light exit side of the optical display system presents a second distant imaging image with a second virtual image distance, wherein the second focal length is different from the first focal length, and the second virtual image distance is different from the first virtual image distance; In the case that the display screen displays the first close-up image, the focal length of the variable focal length lens is adjusted to a third focal length, so that the second polarized light is transmitted to the optical lens via the variable focal length lens. The light exit side of the display system presents a first close-range imaging picture with a third virtual image distance; when the display screen displays the second close-range picture, the focal length of the variable focal length lens is adjusted to the fourth focal length to So that the second polarized light is transmitted to the light exit side of the optical display system through the variable focal length lens, and then presents a second close-range imaging image with a fourth virtual image distance, wherein the fourth focal length and the third focal length The focal length is different, and the fourth virtual image distance is different from the third virtual image distance.

Description of the drawings

The drawings constituting a part of the specification describe the embodiments of the present disclosure, and together with the specification, serve to explain the principle of the present disclosure.

With reference to the accompanying drawings, the present disclosure can be understood more clearly according to the following detailed description, in which:

FIG. 1 is a schematic diagram showing the structure of an optical display system according to an embodiment of the present disclosure;

2 is a schematic diagram showing the structure of an optical display system according to another embodiment of the present disclosure;

3 is a schematic diagram showing the structure of an optical display system according to another embodiment of the present disclosure;

4 is a schematic diagram showing the structure of an optical display system according to still another embodiment of the present disclosure;

FIG. 5 is a schematic flowchart showing an optical display method according to an embodiment of the present disclosure.

It should be understood that the dimensions of the various parts shown in the drawings are not necessarily drawn in accordance with the actual proportional relationship. In addition, the same or similar reference numerals indicate the same or similar components.

detailed description

Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. The description of the exemplary embodiments is merely illustrative, and in no way serves as any limitation to the present disclosure and its application or use. The present disclosure can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided to make the present disclosure thorough and complete, and to fully express the scope of the present disclosure to those skilled in the art. It should be noted that unless specifically stated otherwise, the relative arrangement of components and steps, material components, numerical expressions and numerical values set forth in these embodiments should be interpreted as merely exemplary rather than limiting.

The "first", "second" and similar words used in the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different parts. Similar words such as "include" or "include" mean that the element before the word covers the elements listed after the word, and does not exclude the possibility of covering other elements as well. "Up", "Down", etc. are only used to indicate the relative position relationship. When the absolute position of the described object changes, the relative position relationship may also change accordingly.

In the present disclosure, when it is described that a specific component is located between the first component and the second component, there may or may not be an intermediate component between the specific component and the first component or the second component. When it is described that a specific component is connected to another component, the specific component may be directly connected to the other component without an intervening component, or may not be directly connected to the other component but with an intervening component.

All terms (including technical terms or scientific terms) used in the present disclosure have the same meaning as understood by those of ordinary skill in the art to which the present disclosure belongs, unless specifically defined otherwise. It should also be understood that terms such as those defined in general dictionaries should be interpreted as having meanings consistent with their meanings in the context of related technologies, and should not be interpreted in idealized or extremely formalized meanings, unless explicitly stated here. Define it like this.

The technologies, methods, and equipment known to those of ordinary skill in the relevant fields may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be regarded as part of the specification.

In the process of viewing with an AR or VR display device, the eye adjusts the diopter through the lens, so that the light incident on the eye is focused on the retina. Since there is a depth difference between the different positions of the three-dimensional object and the retina, the eyes need to perform Vergence rotation to adapt to the depth difference. However, in the related art, the distance between the virtual image plane where the imaging picture is located and the eye is constant, and the viewer does not need to perform refractive adjustment when viewing the imaging picture. In this way, there will be a conflict between the convergent rotation of the eyes and the constant refractive adjustment (that is, the convergent conflict), and the viewer is prone to fatigue when viewing the imaged picture on the virtual image plane for a long time.

FIG. 1 is a schematic diagram showing the structure of an optical display system according to an embodiment of the present disclosure.

As shown in FIG. 1, the optical display system may include a display screen 11, a light splitting part 12, a first optical waveguide 13 and a second optical waveguide 14.

The display screen 11 is configured to display a picture. For example, the display screen 11 may be a micro-organic light-emitting diode (Micro-OLED) display or a digital light processing (DLP) display or the like.

The spectroscopic part 12 is configured to divide the light L from the display screen 11 into first polarized light L1 and second polarized light L2 having different polarization directions. It should be understood that the light L from the display screen 11 is natural light, and after being split by the light splitting component 12, it becomes the first polarized light L1 and the second polarized light L2 with different polarization directions. For example, the first polarized light L1 may be P light, and the second polarized light L2 may be S light; for another example, the first polarized light L1 may be S light, and the second polarized light L2 may be P light.

The first optical waveguide 13 is configured to guide the first polarized light L1 to the light exit side of the optical display system, for example, the upper side.

The second optical waveguide 14 is located on the light exit side of the first optical waveguide 13 and is spaced apart from the first optical waveguide 13. The second optical waveguide 14 is configured to at least partially transmit the first polarized light L1 and guide the second polarized light L2 to the light exit side of the optical display system, for example, the upper side.

Here, the first polarized light L1 exits from the first optical waveguide 13 and first enters the second optical waveguide 14, and then exits from the second optical waveguide 14 to the light exit side of the optical display system. As shown in Fig. 1, for example, the first polarized light L1 can be focused on the focal plane A after exiting from the second optical waveguide 13, and the second polarized light L2 can be focused on the focal plane B after exiting from the second optical waveguide 13, for example.

It should be understood that the lens assembly can be used to control the optical power of the first polarized light L1 and the second polarized light L2, so that when the optical display system uses the first polarized light L1 and the second polarized light L2 to form images, the imaging images are located at different positions. Virtual image plane. Here, the virtual image plane is located on the non-light emitting side of the optical display system, that is, the lower side of the first optical waveguide 13.

In some implementations, referring to FIG. 1, the optical display system may include a first lens assembly 15 having a first focal length and a second lens assembly 16 having a second focal length. Here, the first focal length is different from the second focal length. The first lens assembly 15 is disposed between the light splitting component 12 and the first optical waveguide 13, and can control the optical power of the first polarized light L1. The second lens assembly 16 is disposed between the light splitting component 12 and the second optical waveguide 14 and can control the optical power of the second polarized light L2. It should be understood that the embodiments of the present disclosure are not limited to the implementation manner shown in FIG. 1, and other implementation manners of the lens assembly will be described later in combination with different embodiments.

In the above embodiment, the optical display system includes a first optical waveguide and a second optical waveguide. The first optical waveguide can guide the first polarized light to the light exit side of the optical display system, and the second optical waveguide can at least partially transmit the first polarized light and guide the second polarized light to the light exit side of the optical display system. Such an optical display system can use the first polarized light and the second polarized light to image separately, so that the imaged images are located on multiple virtual image planes.

In some embodiments, referring to FIG. 1, the optical display system may further include a first light valve 17 and a second light valve 18. The first light valve 17 is disposed between the light splitting part 12 and the first optical waveguide 13, for example, between the light splitting part 12 and the first lens assembly 15. The second light valve 18 is disposed between the light splitting component 12 and the second optical waveguide 14, for example, between the light splitting component 12 and the second lens assembly 16.

The first light valve 17 is configured to control whether the first polarized light L1 can enter the first optical waveguide 13. For example, the first light valve 17 is configured to transmit the first polarized light L1 when the display screen 11 displays a distant view image, and not transmit the first polarized light L1 when the display screen 11 displays a close view image. The second light valve 18 is configured to control whether the second polarized light L2 can enter the second optical waveguide 14. For example, the second light valve 18 is configured to transmit the second polarized light L2 when the display screen 11 displays a close-up image, and not transmit the second polarized light L2 when the display screen 11 displays a long-range image.

The display screen 11 can alternately display a distant view image and a close view image at a certain frequency. When the display screen 11 displays a distant view, the first polarized light L1 can enter the first optical waveguide 13 after passing through the first light valve 17 (for example, via the first lens assembly 15), and then be guided to the light output of the optical display system. The second polarized light L2 is blocked by the second light valve 18 and cannot enter the second optical waveguide 14. When the display screen 11 displays a close-up image, the second polarized light L2 can enter the second optical waveguide 14 after passing through the second light valve 18 (for example, via the second lens assembly 16), and then be guided to the light output of the optical display system. The first polarized light L1 is blocked by the first light valve 17 and cannot enter the first optical waveguide 13. Therefore, the first polarized light L1 and the second polarized light L2 can be alternately imaged without interfering with each other.

As some implementations, at least one of the first light valve 17 and the second light valve 18 may include a liquid crystal light valve. As other implementations, at least one of the first light valve 17 and the second light valve 18 may include a microelectromechanical system (MEMS) light valve. However, the embodiment of the present disclosure is not limited to this, as long as the first light valve 17 and the second light valve 18 can realize the light blocking function.

It should be understood that in the case of imaging using the first polarized light L1, the first lens assembly 15 can control the virtual image plane where the imaging picture is located farther from the eye; in the case of imaging using the second polarized light L2, the second lens assembly 16 You can control the virtual image plane where the imaging picture is located closer to the eyes. In this way, when the viewer is watching the imaging picture, the refractive adjustment and the convergence adjustment are performed synchronously, which reduces the convergence conflict, thereby alleviating eye fatigue.

FIG. 2 is a schematic diagram showing the structure of an optical display system according to another embodiment of the present disclosure.

The difference between the optical display system shown in FIG. 2 and the optical display system shown in FIG. 1 is that the lens components used to control the refractive powers of the first polarized light L1 and the second polarized light L2 are different.

The optical display system shown in FIG. 2 includes a third lens assembly 19 and a fourth lens assembly 20. The third lens assembly 19 is arranged between the display screen 11 and the light splitting component 12, and can control the optical power of the first polarized light L1. The fourth lens assembly 20 is disposed between the light splitting component 12 and the second optical waveguide 14, for example, between the second light valve 20 and the second optical waveguide 14. Both the third lens assembly 19 and the fourth lens assembly 20 can control the optical power of the second polarized light L2.

In some embodiments, referring to FIGS. 1 and 2, the light splitting member 12 may include a polarizing reflector 121, a first light reflecting member 122 and a second light reflecting member 123. The first reflective member 122 and the second reflective member 123 may be, for example, plane mirrors.

The polarizing reflection sheet 121 is configured to divide the light L from the display screen 12 into the first polarized light L1 and the second polarized light L2. The first light reflecting member 122 is configured to reflect the first polarized light L1 from the polarizing reflection sheet 121 to be incident on the first optical waveguide 13. For example, the first polarized light L1 is reflected by the first reflective member 122 and then enters the first light valve 17, and then enters the light incident surface of the first optical waveguide 13. The second light reflecting member 123 is configured to reflect the second polarized light L2 from the polarizing reflection sheet 121 to be incident on the second optical waveguide 14. For example, the second polarized light L2 is reflected by the second reflective member 123 and then enters the second light valve 18 and then enters the light incident surface of the second optical waveguide 14.

In some embodiments, referring to FIGS. 1 and 2, the first optical waveguide 13 may include a first optical waveguide body 131 and a semi-reflective and semi-transmissive member 132 provided in the first optical waveguide body 131. The first optical waveguide body 131 is configured such that the first polarized light L1 is totally reflected in the first optical waveguide body 131. The semi-reflective and semi-transmissive part 132 is configured to partially reflect the first polarized light L1 and partially transmit the first polarized light L1.

For example, the semi-reflective and semi-transparent component 132 may include a plurality of semi-reflective and semi-transparent films 1321 that are parallel and spaced apart from each other. A part of the first polarized light L1 incident on the semi-reflective semi-transparent film 1321 is reflected to the light exit side of the first optical waveguide 13, and a part of the first polarized light L1 is transmitted through the first optical waveguide body 131 and continues to be totally reflected and propagated.

In some embodiments, referring to FIGS. 1 and 2, the second optical waveguide 14 may include a second optical waveguide body 141 and a polarization member 142 provided in the second optical waveguide body 141. The second optical waveguide body 141 is configured to cause the second polarized light L2 to propagate in the second optical waveguide body 141 by total reflection. The polarizing part 142 is configured to at least partially reflect the second polarized light L2 and completely transmit the first polarized light L1. In this case, the first polarized light L1 emitted from the first optical waveguide 13 can all pass through the second optical waveguide 142. On the one hand, it will not cause the loss of the first polarized light L1, and on the other hand, it will not interact with the second Polarized light L2 is mixed to avoid imaging crosstalk.

The polarization component 142 can be implemented in different ways. In some implementations, as shown in FIGS. 1 and 2, the polarization component 142 may include a plurality of polarizing reflection films 1421 that are parallel and spaced apart from each other, and each of the polarization reflection films 1421 is configured to partially reflect the second polarized light L2 and partially transmit the second polarized light L2. The second polarized light L2. It should be understood that the polarizing reflection film 1421 may include a multilayer film. The reflectance of the polarized reflection film 1421 to the second polarized light L2 can be adjusted by adjusting the material and thickness of the multilayer film.

The plurality of semi-reflective films 1321 and the plurality of polarized reflection films 1421 can make the distribution range of the first polarized light L1 and the second polarized light L2 wider. In this way, the distribution angle of the light received by the eye is larger, which is more conducive to The viewer watches the imaging screen.

In other implementations, the polarization component 142 may be implemented in other implementations. The description will be made below in conjunction with the embodiment shown in FIG. 3.

FIG. 3 is a schematic diagram showing the structure of an optical display system according to another embodiment of the present disclosure.

In the optical display system shown in FIG. 3, the polarizing member 142 includes a curved polarizing reflection film. The curved polarized reflection film is configured to completely reflect the second polarized light L2.

In addition, the optical display system shown in FIG. 3 may include a fifth lens assembly 21 disposed between the display screen 11 and the light splitting part 12. The fifth lens assembly 21 can control the optical power of the first polarized light L1, and both the fifth lens assembly 21 and the polarization component 142 can control the optical power of the second polarized light L2.

In some embodiments, the optical display system may further include a variable focal length lens arranged on the light exit side of the second optical waveguide 14. For example, the optical display system shown in FIGS. 1 to 3 may additionally include a variable focal length lens. The following is an explanation with reference to Fig. 4.

FIG. 4 is a schematic diagram showing the structure of an optical display system according to still another embodiment of the present disclosure.

Compared with the optical display system shown in FIG. 1, the optical display system shown in FIG. 4 further includes a variable focal length lens 22. As some examples, the variable focal length lens may include, but is not limited to, a liquid crystal lens. For example, the focal length of the liquid crystal lens can be changed by controlling the distribution of liquid crystal molecules in the liquid crystal lens.

In the optical display system of the above embodiment, both the first lens assembly 15 and the variable focal length lens 22 can control the optical power of the first polarized light L1, and both the second lens assembly 16 and the variable focal length lens 22 can control the first polarized light L1. The optical power of the two-polarized light L2.

It should be understood that since the focal length of the variable focal length lens 22 is adjustable, the optical display system can make the imaged image lie on two or more virtual image planes. It should also be understood that the optical display system shown in FIG. 4 may not include the first lens assembly 15 and the second lens assembly 16 but include the variable focal length lens 22.

The optical display system provided by the various embodiments of the present disclosure may be applied to a display device, such as an AR or VR display device. The embodiments of the present disclosure also provide a display device, including the optical display system of any one of the above embodiments.

In the display device, only one display screen can be used to realize the light field display, which reduces the power consumption of the display device.

The embodiments of the present disclosure also provide an optical display method of the optical display system based on any one of the above embodiments.

FIG. 5 is a schematic flowchart showing an optical display system according to an embodiment of the present disclosure.

In step 502, the display screen alternately displays a close-up picture and a long-range picture.

As an example, referring to FIG. 1 to FIG. 4, the frequency at which the display screen 11 alternately displays the distant view image and the close view image may be greater than or equal to 100 Hz. In this case, the eyes can continuously receive imaging images located on different virtual image planes.

In step 504, the light splitting component divides the light from the display screen into first polarized light and second polarized light with different polarization directions.

In step 506, when the display screen displays a distant view, the first optical waveguide guides the first polarized light to the light exit side of the optical display system.

In step 508, when the display screen displays a close-up image, the second optical waveguide guides the second polarized light to the light exit side of the optical display system.

In the above embodiment, when the display screen displays a distant view, the first polarized light can be used for imaging; when the display screen displays a close view, the second polarized light can be used for imaging. In this manner, by controlling the optical powers of the first polarized light and the second polarized light, the imaging images can be located on multiple virtual image planes.

In some embodiments, the optical display system may include a first light valve 17 and a second light valve 18, as shown in FIGS. 1-4. The first light valve 17 is provided between the spectroscopic member 12 and the first optical waveguide 13, and the second light valve 18 is provided between the spectroscopic member 12 and the second optical waveguide 14. When the display screen 11 displays a distant view, the first light valve 17 is controlled to open to transmit the first polarized light L1, and the second light valve 18 can be controlled to close so as not to transmit the second polarized light L2. When the display screen 11 displays a close-up image, the first light valve 18 can be controlled to close so as not to transmit the first polarized light L1, and the second light valve 18 can be controlled to open to transmit the second polarized light L2.

In some embodiments, the optical display system may include a focal length variable lens 22 located on the light exit side of the second optical waveguide 14, as shown in FIG. 4.

In some implementations, by adjusting the focal length of the variable focal length lens 22, the optical display system can present a long-range imaging image and a close-range imaging image with different virtual image distances.

For example, in the case that the display screen 11 displays a distant view, the focal length of the variable focal length lens 22 can be adjusted to the first focal length, so that the first polarized light L1 is transmitted to the light exit side of the optical display system through the variable focal length lens 22 and then appears. A distant imaging picture with the first virtual image distance.

For example, when the display screen 11 displays a close-up image, the focal length of the variable focal length lens 22 can be adjusted to the second focal length, so that the second polarized light L2 is transmitted to the light exit side of the optical display system through the variable focal length lens and then appears to have A close-up imaging screen at the second virtual image distance. Here, the second focal length is different from the first focal length, and the second virtual image distance is different from the first virtual image distance.

In other implementations, by adjusting the focal length of the variable focal length lens 22, the optical display system can present multiple long-range imaging images with different virtual image distances and multiple close-range imaging images with different virtual image distances. In this case, the long-range images displayed on the display screen 11 may include first and second long-range images that are alternately displayed and correspond to different object distances, and the close-up images displayed on the display screen 11 may include alternately displayed first and second long-range images corresponding to different object distances. A close-up picture and a second close-up picture. It should be understood that, visually, the distances between the first long-range image and the second long-range image from the surface of the display screen are different, and the distances between the first close-range image and the second close-range image and the surface of the display screen 11 are also different.

In the case where the display screen 11 displays the first perspective image, the focal length of the variable focal length lens 22 can be adjusted to the first focal length, so that the first polarized light L1 is transmitted to the light exit side of the optical display system through the variable focal length lens 22 and then appears The first long-range imaging frame with the first virtual image distance.

In the case that the display screen 11 displays the second distant view, the focal length of the variable focal length lens 22 can be adjusted to the second focal length, so that the first polarized light L1 is transmitted to the light exit side of the optical display system through the variable focal length lens 22 and then appears A second long-range imaging frame with a second virtual image distance. Here, the second focal length is different from the first focal length, and the second virtual image distance is different from the first virtual image distance.

When the display screen 11 displays the first close-up image, the focal length of the variable focal length lens 22 can be adjusted to the third focal length, so that the second polarized light L2 is transmitted to the light exit side of the optical display system through the variable focal length lens 22 and then appears The first close-range imaging frame with the third virtual image distance.

When the display screen 11 displays the second close-up image, the focal length of the variable focal length lens 22 can be adjusted to the fourth focal length, so that the second polarized light is transmitted to the light exit side of the optical display system through the variable focal length lens 22 and then appears to have The second close-range imaging frame at the fourth virtual image distance. Here, the fourth focal length is different from the third focal length, and the fourth virtual image distance is different from the third virtual image distance. It should be understood that each of the fourth virtual image distance and the third virtual image distance is smaller than each of the second virtual image distance and the first virtual image distance.

It should be understood that the display screen 11 may display more than two long-range images and more than two close-range images in a time-sharing manner. By adjusting the focal length of the variable focal length lens 22, the optical display system can present two or more distant imaging images with different virtual image distances and two or more close-range imaging images with different virtual image distances.

So far, the various embodiments of the present disclosure have been described in detail. In order to avoid obscuring the concept of the present disclosure, some details known in the art are not described. Based on the above description, those skilled in the art can fully understand how to implement the technical solutions disclosed herein.

Although some specific embodiments of the present disclosure have been described in detail through examples, those skilled in the art should understand that the above examples are only for illustration and not for limiting the scope of the present disclosure. Those skilled in the art should understand that the above embodiments can be modified or some technical features can be equivalently replaced without departing from the scope and spirit of the present disclosure. The scope of the present disclosure is defined by the appended claims.

Claims

An optical display system, including:

Display screen

The light splitting component is configured to divide the light from the display screen into first polarized light and second polarized light with different polarization directions;

A first optical waveguide configured to guide the first polarized light to the light exit side of the optical display system; and

The second optical waveguide is located on the light exit side of the first optical waveguide and is spaced apart from the first optical waveguide, and is configured to at least partially transmit the first polarized light and guide the second polarized light To the light-emitting side of the optical display system.
The optical display system according to claim 1, wherein the second optical waveguide comprises:

The second optical waveguide body is configured to cause the second polarized light to propagate through total reflection in the second optical waveguide body; and

The polarization component provided in the second optical waveguide body is configured to at least partially reflect the second polarized light and completely transmit the first polarized light.
The optical display system according to claim 2, wherein the polarizing part comprises a plurality of polarizing reflection films that are parallel and spaced apart from each other, and each polarizing reflection film is configured to partially reflect the second polarized light and partially transmit the second polarized light. Mentioned second polarized light.
The optical display system according to claim 1, wherein the first optical waveguide comprises:

The first optical waveguide body is configured to cause the first polarized light to propagate through total reflection in the first optical waveguide body; and

The semi-reflective and semi-transmissive component provided in the first optical waveguide body is configured to partially reflect the first polarized light and partially transmit the first polarized light.
4. The optical display system of claim 4, wherein the semi-reflective and semi-transmissive part comprises a plurality of semi-reflective and semi-transparent films that are parallel and spaced apart from each other.
The optical display system according to any one of claims 1-5, further comprising:

The first light valve is disposed between the light splitting component and the first optical waveguide, and is configured to transmit the first polarized light when the display screen displays a distant view image, and display a close view on the display screen Does not transmit the first polarized light in the case of a picture; and

The second light valve is disposed between the light splitting component and the second optical waveguide, and is configured to transmit the second polarized light when the display screen displays a close-up image, and display a long-range view on the display screen. In the case of a picture, the second polarized light is not transmitted.
The optical display system according to claim 6, wherein at least one of the first light valve and the light valve comprises a liquid crystal light valve.
The optical display system according to any one of claims 1-7, further comprising:

A first lens assembly having a first focal length and arranged between the light splitting component and the first optical waveguide; and a second lens assembly having a second focal length different from the first focal length and arranged on the light splitting element Between the component and the second optical waveguide.
The optical display system according to any one of claims 1-7, further comprising:

The third lens assembly is arranged between the display screen and the light splitting component; and

The fourth lens assembly is arranged between the light splitting component and the second optical waveguide.
3. The optical display system according to claim 2, wherein the polarizing member comprises a curved polarizing reflection film, and the polarizing reflection film is configured to totally reflect the second polarized light.
The optical display system according to claim 10, further comprising:

The fifth lens assembly is arranged between the display screen and the light splitting component.
The optical display system according to any one of claims 1-11, further comprising:

The variable focal length lens is arranged on the light exit side of the second optical waveguide.
The optical display system according to claim 12, wherein the variable focal length lens comprises a liquid crystal lens.
The optical display system according to any one of claims 1-13, wherein the light splitting component comprises:

A polarizing reflector configured to divide the light from the display screen into the first polarized light and the second polarized light;

A first light reflecting member configured to reflect the first polarized light from the polarizing reflector and then enter the first optical waveguide; and

The second light reflecting member is configured to reflect the second polarized light from the polarizing reflector and then enter the second optical waveguide.
A display device, comprising: the optical display system according to any one of claims 1-14.
An optical display method for an optical display system according to any one of claims 1-14, comprising:

The display screen alternately displays the close-up picture and the long-range picture;

The light splitting component divides the light from the display screen into first polarized light and second polarized light with different polarization directions;

In the case that the display screen displays a distant view, the first optical waveguide guides the first polarized light to the light exit side of the optical display system; and

When the display screen displays a close-up image, the second optical waveguide guides the second polarized light to the light exit side of the optical display system.
The optical display method according to claim 16, wherein the optical display system comprises a first light valve and a second light valve, and the first light valve is disposed between the light splitting member and the first optical waveguide , The second light valve is arranged between the light splitting component and the second optical waveguide, wherein:

When the display screen displays a distant view, controlling the first light valve to open to transmit the first polarized light, and controlling the second light valve to close so as not to transmit the second polarized light;

When the display screen displays a close-up image, the first light valve is controlled to close so as not to transmit the first polarized light, and the second light valve is controlled to open to transmit the second polarized light.
17. The optical display method according to claim 17, wherein the optical display system comprises a focal length variable lens located on the light exit side of the second optical waveguide;

The optical display method further includes:

In the case that the display screen displays a distant view, the focal length of the variable focal length lens is adjusted to the first focal length, so that the first polarized light is transmitted to the light output of the optical display system through the variable focal length lens The far-view imaging picture with the first virtual image distance is presented from the back side;

When the display screen displays a close-up image, the focal length of the variable focal length lens is adjusted to the second focal length, so that the second polarized light is transmitted to the light output of the optical display system through the variable focal length lens A close-up imaging picture with a second virtual image distance is presented behind the side, wherein the second focal length is different from the first focal length, and the second virtual image distance is different from the first virtual image distance.
The optical display method according to claim 17, wherein the optical display system includes a variable focal length lens located on the light exit side of the second optical waveguide, and the distant view image includes first alternately displayed and corresponding to different object distances. A long-range picture and a second long-range picture, the close-range picture including a first close-range picture and a second close-range picture that are alternately displayed and correspond to different object distances;

The optical display method further includes:

In the case that the display screen displays the first distant view image, the focal length of the variable focal length lens is adjusted to the first focal length, so that the first polarized light is transmitted to the optical lens via the variable focal length lens. The light-emitting side of the display system presents a first long-range imaging picture with a first virtual image distance;

In the case that the display screen displays the second long-distance picture, the focal length of the variable focal length lens is adjusted to the second focal length, so that the first polarized light is transmitted to the optical lens via the variable focal length lens. The light exit side of the display system presents a second distant imaging image with a second virtual image distance, wherein the second focal length is different from the first focal length, and the second virtual image distance is different from the first virtual image distance;

In the case that the display screen displays the first close-up image, the focal length of the variable focal length lens is adjusted to a third focal length, so that the second polarized light is transmitted to the optical lens via the variable focal length lens. A first close-range imaging picture with a third virtual image distance is presented behind the light-emitting side of the display system;

In the case that the display screen displays the second close-up image, the focal length of the variable focal length lens is adjusted to the fourth focal length, so that the second polarized light is transmitted to the optical lens via the variable focal length lens. The light exit side of the display system presents a second close-range imaging picture with a fourth virtual image distance, wherein the fourth focal length is different from the third focal length, and the fourth virtual image distance is different from the third virtual image distance.